by Rupak Dhiman on WordPress.org
This is a Free add-on to Give donation plugin which allows admin to restrict the content of their website until a user has made a donation.
Once a user has made the donation they can access the content. Admin can choose to restrict the content of the site via shortcode or they restrict the entire website or a particular page, post, category, post type, etc… with the help of plugin settings.
You can also track the development at : https://github.com/contriveitup/give-add-on-donate-to-access-content
Note: Installation of a WordPress Plugin manually requires FTP familiarity and the awareness that you may put your site at risk if you install a WordPress Plugin incompatible with the current version or from an unreliable source.